A father who injected his 4-year-old son with a lethal drug cocktail in September 2013 in Redmond pleaded guilty to attempted first-degree murder. Eric Lehtinen, 39, faces a prison sentence of 15 to 20 years.

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A 39-year-old former Redmond man pleaded guilty Thursday to attempted first-degree murder, admitting he injected his then-4-year-old son with a potentially lethal dose of heroin, ketamine and other drugs.

Eric Lehtinen, who also was treated for an overdose after his estranged wife found him and their son unresponsive in bed, faces a prison sentence of up to 20 years. In exchange for his guilty plea, the state agreed to dismiss three aggravating factors that, if proven, would have made Lehtinen eligible for longer sentence, said King County Deputy Prosecutor Benjamin Gauen.

The defense is seeking a 15-year sentence, while the state will recommend Lehtinen serve 20 years, according to Gauen and defense attorney Peter Mazzone. The state will also ask a judge to issue a lifetime order barring Lehtinen from having any contact with his son or the boy’s mother, Gauen said.

The boy will turn 6 on Sunday.

Lehtinen is to be sentenced Sept. 4, though it’s expected the defense will ask for a continuance, Mazzone told Superior Court Judge Douglass North.

According to charging papers, Lehtinen’s estranged wife and son were living with family in San Francisco but returned to Washington in September 2013 because the mother had a job interview here.

She agreed to let her son spend the night with his father on Sept. 23, 2013, believing Lehtinen’s claims that he had quit using and dealing drugs, the papers say.

The next day — the same day the couple’s divorce was finalized — the boy’s mother used a key and let herself into Lehtinen’s house on Northeast 72nd Street in Redmond after her knocks went unanswered, according to the charges. She found father and son apparently asleep together in bed, but when she pulled the blanket off her 4-year-old, she saw a syringe lying on the boy’s chest, the papers say.

Unable to wake either of them, the woman called 911.

The boy was treated for an overdose at Seattle Children’s while Lehtinen was treated at EvergreenHealth, charges say. Three days later, Lehtinen was booked into the King County Jail, where he’s since remained in lieu of $3 million bail, jail records show.

Doctors at Children’s discovered the boy had several puncture wounds from needle sticks on his neck and buttocks, with toxicology tests showing the boy had heroin, ketamine, morphine, codeine, norketamine and lidocaine in his system, say charging papers.

In a later search of Lehtinen’s house, police found several syringes filled with drugs, paraphernalia and more than $12,000 cash, according to the papers. Lehtinen, who had a long history of drug use and overdoses, had been treated for an overdose two months earlier, charging papers say.