A suspect in the Aug. 31 killing of wine steward Yancy Noll was ordered held without bond Saturday after a judge was told that the suspect had gone to great lengths to conceal possible evidence of the crime — including hiding his car, repainting its wheels, replacing glass that had been shot out of the passenger-side window and changing all four tires, even though they were still usable.

A charge of first- or second-degree murder against Dinh Bowman will be filed by Tuesday, said Scott O'Toole, senior deputy prosecuting attorney for King County.

At a hearing Saturday at the King County Jail, O'Toole asked that Bowman be held without bond on the basis of what he called Bowman's extreme risk to the public and the steps he took to conceal possible evidence of the killing.

Bowman, 29, is a graduate of the University of Washington with a degree in electrical engineering. It is not believed that Bowman and Noll, 43, knew each other, O'Toole said.

Noll was sitting in his car at 15th Avenue Northeast and Northeast 75th Street at 7:26 p.m. Aug. 31 when a silver BMW Z4 convertible pulled up next to him and the driver fired five shots, three of which struck Noll in the side of the head.

He died at Harborview Medical Center a short time later.

Bowman was arrested Friday at his home.

A search by investigators of Vague Industries in Sodo, where Bowman works, turned up the old tires, as well as masking tape used to paint the wheels, O'Toole said.

O'Toole also said that staff at Big O, a tire shop in Lynnwood where Bowman had the tires changed, told investigators they also found it odd that Bowman insisted on taking all eight tires with him from the store, the old as well as the new, cramming them into his wife's Mercedes.

A search of Bowman's home in the 7400 block of 25th Avenue Northeast in recent days also turned up a room filled with weapons and bullet-making tools, but no handgun similar to the one used to kill Noll, which police believe he discarded.

The refrigerator in his home also had a Post-it note reading "To the best shot in the wild west. Bang Bang," from his wife, according to authorities.

O'Toole said investigators made note of a posting online of Bowman, who had used a helmet-mounted camera to photograph himself shooting out targets while running an obstacle course, drilling the targets accurately even from a great distance.

The shooting of Noll may have been a road-rage incident, O'Toole said, but that is not known for sure.

Bowman had not made any statement to police as of Saturday.

Bowman, who was a teen prodigy once nationally ranked in fencing while taking college-level computer science courses as a 13-year-old, in 2006 was acquitted of burglary and first-degree theft.

Lynda V. Mapes: 206-464-2736 or lmapes@seattletimes.com. On Twitter @lyndavmapes.