Mindy McCready's Celebrity Rehab Cast Mate Lisa D'Amato: 'I'm Devastated'

On Sunday night, when news hit of Mindy McCready’s apparent suicide, Lisa D’Amato got a phone call from actress Mackenzie Phillips, a cast mate on season 3 of Celebrity Rehab with Dr. Drew.

“We were just trying to put it all together, figure out what happened,” D’Amato tells PEOPLE. “Mackenzie doesn’t know either. The one thing about Mindy is that she was very much seeming to be fine and perfect on the surface, but she was battling a lot.”

Joey Kovar: Real World Star's Hopes and Demons Before His Mysterious Death

For hours on Aug. 22, Melanie Tomas stood next to Joey Kovar’s coffin, refusing to leave his side, until the last of approximately 1,000 mourners finally left the Kosary Funeral Home in Evergreen Park, Ill., at 11 p.m.

Even now, more than two weeks after the wake for her off-and-on boyfriend – a reality star from MTV’s The Real World: Hollywood in 2008 – Tomas, 24, is struggling to make sense out of his sudden death at age 29.

Michaele Salahi Joins – and Leaves – Celebrity Rehab with Dr. Drew

Reality check?

Stars like Janice Dickinson and Dennis Rodman have appeared on VH1’s Celebrity Rehab with Dr. Drew to fight their addictions to alcohol and other substances, but Michaele Salahi, a star of The Real Housewives of Washington D.C., wanted to appear on the reality show for a different reason.

Mike Starr Found Dead

Former Alice in Chains bassist Mike Starr, who appeared on season 3 of the VH1 reality show Celebrity Rehab, was found dead in Salt Lake City on Tuesday, according to reports. He was 44.

The cause and manner of death were not immediately known, according to CNN.

Heidi Montag: I'm Not Joining the Cast of Celebrity Rehab

Heidi Montag is no stranger to the cameras – or controversy – but she’s not checking into Dr. Drew Pinsky’s Celebrity Rehab for pill addiction.

“No, I’m not joining the cast, she tells PEOPLE exclusively, shooting down a report that claims the former Hills star was dropped off at treatment two days ago and is sharing a room with Real Housewives of D.C. star Michaele Salahi on Rehab.

Why Rachel Uchitel Left – and Returned to – Celebrity Rehab

When VH1 announced the list of names of who will appear on the upcoming season of Celebrity Rehab with Dr. Drew, Rachel Uchitel was among them. But Tiger Woods’s alleged mistress reportedly left the Pasadena Recovery Center where the show is taped.