Jacob Anthonisen, Lindsay Lohan Pal, Implicated in Murder Investigation

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Jacob Anthonisen, an art dealer and friend of Lindsay Lohan and other stars, is currently being sought in a murder investigation, according to Radar Online.

The 37-year-old, who runs with the likes of Emile Hirsch, Mickey Avalon, Taryn Manning and Lady Victoria Hervey, has been named a person of interest.

On June 9, a decomposing body was found in the back of a Cadillac Escalade registered to Jacob Anthonisen in a parking lot in West Hollywood, Calif.

Jacob Anthonisen Mug Shot

The remains were identified on Thursday as Steven John Simmons - Jacob's stepbrother - and the cause of death was a gunshot wound to the chest.

"He has been involved with some very dangerous people in the past, and we are worried that they have something to do with this," a close pal said.

Anthonisen, who owns The Peanut Gallery in L.A., has been missing since May 31. "At this point, everyone is just hoping he is alive and well," a pal said.

"But it's no secret that he served time in prison for drugs, so it's something to consider here. The circumstances lead us to believe drugs played a role."

Anthonisen has something of a troubled past, having served two years in prison from 2003-2005. He was convinced on drug-related charges in Arizona.