LYNNWOOD — The suspect in a fatal hit-and-run in Lynnwood Tuesday may have been using marijuana, according to court papers.

The Lynnwood man, 53, is being investigated for vehicular homicide, DUI and hit-and-run.

A 911 caller reported seeing a blue Chevrolet pickup truck swerve to the right, hit the curb and strike a pedestrian Tuesday morning near the intersection of 158th Street SW and 35th Avenue W.

The Snohomish County Sheriff’s Office Collision Investigation Unit was called to the scene, where deputies found a man dead on the shoulder of the road.

“At no point did the Driver in the vehicle attempt to stop and look at the pedestrian to see if he was ok,” a sheriff’s deputy wrote in a probable cause affidavit filed in Everett District Court.

Deputies quickly found a pickup truck matching the suspect’s description on 164th Street SW, near North Road, less than three miles away. They watched as the driver failed to use his signal to get onto Highway 527. Then he reportedly took a left onto 161st Street SE and hit the median. When he pulled over, he hit the curb, and parked on top of it with the right passenger tire, according to court papers. Deputies noted the pickup had front-end damage.

The driver reportedly agreed to go through field sobriety tests. He started the walk-and-turn too soon three times, didn’t turn properly, didn’t count the right number of steps and didn’t walk heel-to-toe, according to the arrest report. He used his arms to balance as he stood on one leg. And his eyes moved slowly and jerked while following a pen.

Deputies noted that the man’s actions appeared consistent with having used marijuana.

The suspect was first taken to Providence Regional Medical Center Everett, where he was cleared to be booked into the Snohomish County Jail.

Zachariah Bryan: 425-339-3431; zbryan@heraldnet.com. Twitter: @zachariahtb.