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ET FIRST: David Cassidy Opens Up From Rehab

The Partridge Family star David Cassidy is opening up to ET from rehab, which he returned to after getting arrested for DUI in January.

The incident marked the third time since 2010 that the 63-year-old former teen idol had been arrested on a charge of driving while intoxicated.

Pics: Celebrity Rehab Successes

"This has been a very difficult time for me battling this deadly disease, like millions of others in our country," he tells ET. "I will remain in treatment for as long as necessary and I am getting the best care I can possibly get anywhere. I am working as hard as any human being to live a sober life. I am truly grateful to all of my friends and fans who have sent me thousands of letters and messages in support."

Cassidy's manager and publicist Jo-Ann Geffen told ET at the time that lawsuits concerning The Partridge Family profits led to a relapse.

Related: Cassidy Returning to Rehab After DUI

"David just completed a stint in rehab and was doing very well in sobriety. He was in Los Angeles to attend depositions by Sony Pictures Television, respondents in a lawsuit filed by Cassidy in 2011 over what he claims are monies long due him from Partridge Family merchandise, home video, etc. After attending his and his manager's depositions, it appears as if the pressure led to a brief relapse. He was on his way to the airport to return to his home in Florida and to transitional rehabilitation. He plans now to return to rehab in an undisclosed facility," Geffen said.

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