NCIS star Pauley Perrette lived through a harrowing experience Thursday night.

The actress was attacked – beaten and her life threatened – by a person she describes as a “VERY psychotic homeless man.”

She detailed the entire ordeal on Twitter.

“I was walking across my street to a new guest house I bought to meet my architect. On my street, I was jumped by a VERY psychotic homeless man. He grabbed me so forcefully, pinned my arm, punched me in the nose, forehead repeatedly telling me he was going to kill me,” says Perrette.

“Then he showed me how he was going to kill me., He Kept repeating his name … I was alone, terrified and trapped. There was an empty garage behind me and I knew if he got me in there I was dead. I knew I couldn’t overcome him. I prayed my heart out and then finally said, ‘William is a beautiful name, I have a little nephew named William.'”

“That’s all I said, all I did, other than praying my heart out. He started to punch me again, and then said: ‘get the fuck out of here’ and I did.”

According to Perrette, she was able to immediately sketch her attacker, and the police were able to find him.

So, tonight was awful, life changing and I'm only grateful to be alive. It's here: pic.twitter.com/vXIT1pkVRc

— Pauley Perrette (@PauleyP) November 13, 2015

“I was shaken and traumatized. My house, my beloved Hollywood. My beloved homeless people that I spend my life protecting. My life changed tonight. My … I don’t know. We need full mental health care. We need housing and help for the homeless. We need to support our cops. We need to not walk alone. I need to heal. I almost died tonight,” she says.

The LAPD have confirmed Perrette’s story. They say they’ve arrested a 45-year-old man named David Merck on felony battery charges.