LOS ANGELES (AP) — “Big Brother” contestant Richard Donato has cut short his return to the CBS reality series.

The network says the season-eight winner known as “Evel Dick” exited unexpectedly Thursday because of a “personal matter.”

CBS provided no details Friday but promised to share next week.

The network says Donato’s exit will be addressed on Wednesday’s episode.

“Big Brother” gathers a group of people in a camera-filled house, with one contestant voted out by the others each week. The last contestant standing wins $500,000.

The 13th season premiered Thursday night.

This time around, eight new players are joined by three pairs of returning contestants. Donato was paired with his estranged daughter, Danielle Donato, who was also a past contestant.