Richie Sambora is under investigation for reportedly threatening to kill his on-off girlfriend of almost 10 years, Nikki Lund.

Lund, 33, told police the former Bon Jovi guitarist, 55, made the threats during a phone call on March 19.

Sources told Daily Mail she told authorities he threatened to “dig a hole in the desert and bury her.”

Police in Calabasas, Calif. have confirmed he’s a “person of interest” in the investigation. Los Angeles County Sheriff’s Office’s Sgt. Tui Wright also told Daily News, “I am confirming we are investigating such an incident.”

Lund is the co-owner of Sambora’s Nikki Rich clothing line, which will likely now be terminated due to the demise of their personal relationship. Things went downhill after Lund, a childhood friend of Kim Kardashian, showed a solo show at L.A. Fashion Week last month.

Sambora is currently on vacation with his ex-wife, Heather Locklear, and their daughter Ava, and rumored to be dating Australian guitarist Orianthi.

image via Peter West/ACE/INFphoto.com