"There is nothing I can say," Angelo Bertolotti tells Us. "I can't believe this is happening. She was a young 32. She wasn't supposed to die like this."
A cause of death has yet been determined, but coroner's Capt. John Kades tells Us that "foul play is not suspected at this time because there were no outward signs of trauma or other injuries."
TMZ.com reports Murphy began vomiting early Sunday morning and told family members she was feeling very ill. The website also reports that various prescriptions were found in her home in the hills above West Hollywood, where she was "found unresponsive" on Sunday morning. She was pronounced dead at 10:04 a.m. at Cedars-Sinai Medical Center in Los Angeles.
"I don't understand how she died," Bertolotti tells Us. "This doesn't make sense to me."
According to the Associated Press, Bertolotti was in the mob and served prison time on federal drug charges. He divorced her mother when Murphy was young and hadn't seen his daughter in "about three years," he tells Us.
"Ever since she married that Simon [Monjack, in 2007], I lost contact with her," he tells Us. "But I always kept track of her to make sure she was OK in case she needed me. She married him and everything changed. After that, we weren't so close."
He tells Us he will "miss her smile and her work ethic. She was such a hard worker. I was so proud of her. This was a girl who had been working since she was 7.
"Everyone she worked with loved her. That's who she was. She was loveable," Bertolotti tells Us. "There is nothing more I can say. I'm trying to make sense of this, and I can't."
For access to all our exclusive celebrity videos and interviews – Subscribe on YouTube!