Prosecutors say Harold Henthorn—the man accused of shoving his wife off a cliff—was no stranger to killing someone and making it look like an accident.

Henthorn was arrested after his wife, Toni, fell from a 140-foot cliff in 2012. Although Henthorn claimed she tripped, police said it was no accident: cops say he purchased a $4.5 million life insurance policy in his wife's name and marked the fall site with an X on a map found nearby.

Toni's death came around a year after another strange accident at the couple's lake house, relatives say. Per the Denver Post:

In early September or late August 2011, the couple was at their Grand Lake cabin when a beam hit Toni Henthorn on her head while she worked on her cabin with Harold Henthorn, fracturing her vertebrae. The beam fell off the porch where Harold Henthorn was working, after he called her to come help him, the record says.

"Toni Henthorn told her mother, 'If I hadn't bent down after I walked outside, the beam would have killed me,' " the document said. She had seen something on the ground and was going to pick it up when the beam struck her.

And as it turns out, Toni wasn't the first Mrs. Henthorn to die under suspicious circumstances—Henthorn's first wife, Sandra Lynn, reportedly died in a freak accident in 1995.

According to reports, the couple were changing a flat tire when, "The car allegedly came off the jack as he was throwing the tire in the trunk, crushing his wife, who was under the car for unknown reasons. There were no witnesses other than Harold Henthorn, and a life insurance policy on her had been taken out several months prior."

Henthorn, who was never arrested in his first wife's death, is now facing first-degree murder charges.

[image via Remembered.com]