Kolby Clark has been formally charged with Murder in the Second Degree for the stabbing death of 17-year old Jasmyn Tully.

“Clark is charged as an adult under Washington state's automatic adult jurisdiction statute for 16-17 years accused of a class A felony,” Ian Goodhew of the King County Prosecutor’s Office said March 20.

Clark, just 17 years old himself, admitted to brutally strangling then stabbing Tully Saturday morning in a Tukwila apartment, according to police. The standard sentence for this charge is 12-20 years in prison, Goodhew said.

After Clark’s “overpowering urge to hurt someone”, he then ran from the apartment and later tried to cut his own wrist in an apparent attempted suicide. When he did not succeed he began walking back to the scene of the murder and began to create his story for the police, said Detective Ron Corrigan in his probable cause report.

Clark first fabricated a story, involving an ex-boyfriend of Tully’s, who is a black man, and also detailed a chase, described by Clark with a Google map, according to investigators. Tukwila detectives searched the area with canine units, but found no evidence the story Clark told was true.

His confession came out when confronted by detectives, they said. He also admitted to inflicting his injury upon his self and it was not by another person, as he originally told detectives, according to court documents.

After several hours of clearing bushes, detectives found the knife that was apparently used in the stabbing.

Although previous reports have stated the use of synthetic marijuana, also known as K2, may have been involved, there has been nothing to confirm that by detectives, said Goodhew.

“No toxicology report was done on the suspect because at the time of his arrest he did not display any sign of impairment,” Goodhew said.

“Patrol officers were with Clark within minutes of the attack upon Tully,” Detective Corrigan said.
“He was very articulate and well-spoken when talking with detectives and no officer or detective thought him to be intoxicated,” Detective Corrigan added.

Clark is currently being held on $1 million bail. Assistant Prosecuting Attorney Donald Raz said he felt the bail amount was appropriate considering his admitted display of uncontrollable behavior.

Clark will be arraigned April 2 at 8:30 a.m. at the Maleng Regional Justice Center in Kent.