Jury weighs self-defense claim in Arlington killing

EVERETT — Dennis Watters was afraid for his life when he fired his handgun into a car at the Blue Stilly Park last year.

One of the bullets struck the passenger, Ryan Mumm, in the temple. The 20-year-old died the next day.

Watters told the cops that he opened fire because he thought Mumm was shooting at him. He said Mumm first pointed a gun at him and then began firing as he passed Watters’ pickup truck.

He “came face-to-face with a young man who was out of control,” defense attorney Jennifer Rancourt said. “Dennis Watters acted out of terror, out of fear and out of panic.”

She called the killing tragic but justifiable.

“The reason Ryan Mumm lost his life was because he pointed a loaded firearm directly at Dennis Watters,” Rancourt said.

Prosecutors painted a different picture of the defendant on Tuesday during closing arguments. Deputy prosecutor Cindy Larsen said Watters, 42, rushed into a beef between young people to prove he was a “tough guy.” He wanted to be the hero.

“He killed someone in cold blood because he was amped up. Why? Because he didn’t want to be” seen as weak, Larsen said.

There was no evidence that Mumm fired at Watters, she told jurors.

The defendant never called 911 to report that he was assaulted or that he shot someone in self-defense. Watters only came clean after police showed up at his doorstep four days later, Larsen said. By then, he had tried to cover up the damage to his pickup truck, cleaned and reloaded his gun and devised a self-defense claim.

“This was all evidence of a guilty conscience. He knew what he did was wrong,” Larsen said.

The Tulalip-area man is charged with first-degree and second-degree murder for the July 14, 2012, shooting. He also is charged with two counts of first-degree assault for later firing at Mumm and another man as their car sped away along Highway 530.

A Snohomish County jury began deliberations Tuesday afternoon. Jurors are faced with a set of complicated legal questions, including whether Watters committed murder under two different theories or whether the slaying was justified.

Prosecutors allege that Watters committed first-degree murder under the theory that he fatally shot Mumm “under circumstance manifesting an extreme indifference to human life.”

Larsen argued that Watters fired his gun indiscriminately in a crowded park, endangering Mumm and other bystanders. He knew there was a grave risk of someone dying and he disregarded the risk, Larsen said.

The deputy prosecutor also argued that Watters is guilty of second-degree murder under the alternate theory that he intended to kill Mumm but didn’t plan the slaying. Jurors also have the option to convict Watters of manslaughter if they don’t find him guilty of murder. They also must decide whether prosecutors proved that the killing wasn’t justifiable.

Watters did not testify during the trial. Instead, jurors heard the recorded statement he provided to Snohomish County sheriff’s detective Joe Dunn and Dave Bilyeu.

Watters told the detectives he had been stupid for getting involved, but he never intended to hurt anyone.

His buddy had asked for his help after the man’s daughter reported being assaulted earlier in the day. Mumm’s friend stole $20 worth of a marijuana from a group of people. A fight broke out. Later, the two groups agreed to meet up at the popular Arlington park to fight some more.

Watters was asked to join the group. He said he had second thoughts when his friend told him that he was armed.

“And that’s when I thought, man, I shouldn’t even (expletive) be here. OK? And I was gonna tell ‘em ‘Dude, why don’t you call the cops or something. Take care of this a different way’ … but I didn’t want to be a (expletive),” Watters said.

Diana Hefley: 425-339-3463; hefley@heraldnet.com.

Talk to us

> Give us your news tips.

> Send us a letter to the editor.

> More Herald contact information.

More in Local News

Two Washington State ferries pass along the route between Mukilteo and Clinton as scuba divers swim near the shore Sunday, Oct. 22, 2023, in Mukilteo, Washington. (Ryan Berry / The Herald)
Ferry system increases ridership by a half million in 2024

Edmonds-Kingston route remains second-busiest route in the system.

Firefighters respond to a 911 call on July 16, 2024, in Mill Creek. Firefighters from South County Fire, Tulalip Bay Fire Department and Camano Island Fire and Rescue left Wednesday to help fight the LA fires. (Photo provided by South County Fire)
Help is on the way: Snohomish County firefighters en route to LA fires

The Los Angeles wildfires have caused at least 180,000 evacuations. The crews expect to arrive Friday.

x
Edmonds police shooting investigation includes possibility of gang violence

The 18-year-old victim remains in critical condition as of Friday morning.

The Everett Wastewater Treatment Plant along the Snohomish River. Thursday, June 16, 2022 in Everett. (Olivia Vanni / The Herald)
Everett council approves water, sewer rate increases

The 43% rise in combined water and sewer rates will pay for large infrastructure projects.

Robin Cain with 50 of her marathon medals hanging on a display board she made with her father on Thursday, Jan. 2, 2025 in Lake Stevens, Washington. (Olivia Vanni / The Herald)
Running a marathon is hard. She ran one in every state.

Robin Cain, of Lake Stevens, is one of only a few thousand people to ever achieve the feat.

People line up to grab food at the Everett Recovery Cafe on Wednesday, Dec. 4, 2024 in Everett, Washington. (Olivia Vanni / The Herald)
Coffee, meals and compassion are free at the Everett Recovery Cafe

The free, membership-based day center offers free coffee and meals and more importantly, camaraderie and recovery support.

Devani Padron, left, Daisy Ramos perform during dance class at Mari's Place Monday afternoon in Everett on July 13, 2016. (Kevin Clark / The Herald)
Mari’s Place helps children build confidence and design a better future

The Everett-based nonprofit offers free and low-cost classes in art, music, theater and dance for children ages 5 to 14.

The Everett Wastewater Treatment Plant along the Snohomish River on Thursday, June 16, 2022 in Everett, Washington. (Olivia Vanni / The Herald)
Everett water, sewer rates could jump 43% by 2028

The rate hikes would pay for improvements to the city’s sewer infrastructure.

Everett to host ‘Fan Zone’ during 2026 World Cup

Current plans for the zones lack specifics, but city staff hope the tournament can turn Everett into a “soccer city.”

The bond funded new track and field at Northshore Middle School on Thursday, Oct. 24, 2024 in Bothell, Washington. (Courtesy of Northshore School District)
Northshore School District bond improvements underway

The $425 million bond is funding new track and field complexes, playgrounds and phase one of two school replacements.

Attorney General Nick Brown signs his election certificate after being sworn in Wednesday at the Washington State Capitol in Olympia. (Ryan Berry/Washington State Standard)
Washington AG to sue over Trump’s birthright citizenship order

This story originally appeared in the Washington State Standard. Washington’s attorney general… Continue reading

Arlington
Troopers: 1 dead in I-5 collision near Arlington

An Arlington man, 18, was declared dead at the scene after colliding with a semi near milepost 212.

Support local journalism

If you value local news, make a gift now to support the trusted journalism you get in The Daily Herald. Donations processed in this system are not tax deductible.