Two men arrested in connection with the shooting death of a Mariner High School sophomore early Tuesday offered conflicting accounts of what led them to 16-year-old Anthony Boro.

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Two men arrested in connection with the shooting death of a Mariner High School sophomore early Tuesday offered conflicting accounts of what led them to 16-year-old Anthony Boro.

Boro was shot to death in the parking lot of the Altia Apartments, 16520 Larch Way, near Lynnwood, just after midnight. The teen was well known at the Mukilteo high school, where he played freshman football, Mark Stewart, Mariner’s football coach told The (Everett) Herald.

Boro, who lived in Everett, had a younger brother at a Mukilteo middle school, Mariner Principal Brent Kline wrote in a letter to students.

In probable-cause documents released by the Snohomish County Prosecutor’s Office on Thursday, sheriff’s investigators didn’t spell out a clear motive for the slaying.

Two residents of the apartment complex, men ages 19 and 24, have been arrested for investigation of first-degree murder. The older man is being held in lieu of $3 million bail; the younger man is being held without bail.

The Seattle Times is not naming the men because they have not been formally charged.

When deputies arrived at the complex shortly after the shooting they found Boro’s body and an aluminum bat nearby, according to probable-cause documents.

Witnesses directed them to the apartment the two suspects shared. Deputies spoke with the older man, who initially said he was in bed when the shooting happened, the documents say. He quickly changed his story and told police he was involved in the shooting, the probable-cause documents said.

Deputies then pulled a gun out of the man’s pants and the man told deputies he had a pill in his hand “to commit suicide,” the documents said. The man was then handcuffed for his safety.

The man told investigators he shot Boro in the back when the younger man was running away from him, according to the documents. The suspect first claimed that he thought Boro was going to break into their apartment, but then he said he only saw him through the door’s “peep hole,” documents said.

The man said he called for the 19-year-old man and they chased Boro, shooting him, the documents said.

The older man told investigators he did two tours in the military in Iraq and was a “trained shooter,” the probable-cause paperwork said.

A witness who had been at the suspect’s apartment said that the older man told her he didn’t know the victim and that he almost seemed “proud” of the shooting, the documents said. The witness said they had been selling methamphetamine that night, the probable-cause documents said.

The 19-year-old man told deputies he had been staying at the older man’s apartment for about two weeks. He said he saw the other man shoot Boro and then the younger man kicked the teenager about three times, the documents said.

Sheriff’s spokeswoman Shari Ireton said investigators don’t believe Boro knew his attackers.