David Cassidy's 'Partridge Family' Co-Star Danny Bonaduce Lends His Support Following Dementia Diagnosis

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Once a Partridge brother, always a Partridge brother. David Cassidy is getting love and support from his TV brother and co-star, Danny Bonaduce.

Bonaduce, who played Danny Partridge to Cassidy’s Keith Douglas Partridge, took to Twitter late Monday to send his Partridge Family co-star well wishes.

WATCH: David Cassidy Reveals Dementia Diagnosis, Says He Was 'In Denial' Yet 'Always Knew This Was Coming'

“David Cassidy once had a bigger fan club than Elvis & the Beatles. If you’re a fan, now is a great time to send him your love & best wishes,” he wrote.

The 57-year-old actor and radio personality was the first of Cassidy’s co-stars to speak out following the tragic news that the legendary actor and musician had been diagnosed with dementia.

Cassidy, 66, told Peopleabout the diagnosis on Monday.

"I was in denial, but a part of me always knew this was coming," Cassidy, who has a long history of the memory loss syndrome in his family, said.

WATCH: EXCLUSIVE: David Cassidy Reveals the Real Story Behind His Onstage Tirade: 'I Couldn't See'

The singer-songwriter also revealed he plans to stop touring, saying, "I want to focus on what I am, who I am and how I’ve been without any distractions. I want to love. I want to enjoy life."

For more on the shocking diagnosis, watch the clip below.