A Granite Falls man was booked into the Snohomish County Jail for investigation of first-degree manslaughter after he allegedly fatally shot his girlfriend on Sunday, according to the Snohomish County Sheriff's Office. The man told sheriff's detectives the shooting was an accident and involved a gun the couple had used during sexual foreplay.

The shooting was reported about 5:30 a.m. Sunday. Deputies responded to the house in the 23200 block of 134th Street Northeast in unincorporated Granite Falls, where the 25-year-old man lived with his 22-year-old girlfriend, their children, and other relatives.

The man told detectives there had been a party at the house on Saturday night and that both he and his girlfriend were drunk. According to the Sheriff's Office, the man said he and the girlfriend had sex. At one point, the man picked up a gun the couple had used during foreplay and it accidentally went off, hitting the woman.

At the time, the couple's two young children were in the same room asleep on a different bed.

A background check revealed that there have been three previous domestic violence incidents between the couple in 2007 and 2009, according to the Sheriff's Office.