He was eliminated from the competition, but was brought back by the network to star in the 14th season of its series The Bachelor.
On 13 November 2012 it was announced he would star in the sixth season of True Blood in 2013.
He starred in the eighth, ninth and tenth season of the TV series (episodes 91 to 119).
He has also starred in the fourth season of the show The Game.
After starring in the third season of popular sitcom High Kick!
He also starred in the seventh season of 24.
Kostroff starred in the fifth season of the series and appeared in all four earlier seasons as a guest star.
He starred in the most popular and highest-rated season of the teen soap in 2004.
He did say, however, that some actors who starred in the first season would be returning.
Barbara Bouchet guest starred in the 1972 season.