Actor David Strickland, who for the past three seasons played the rock critic on the Brooke Shields NBC sitcom “Suddenly Susan,” was found dead in a Las Vegas adult motel room Monday. He had apparently hanged himself with a bedsheet tied to a ceiling beam. Police authorities told reporters that a chair stood next to his body and an empty beer container was found inside the room. Motel owner Peter Napoli told NBC News he was unaware if police found a note. Strickland’s publicists confirmed the suicide and said there was no apparent reason why the 28-year-old took his own life. Strickland’s career looked to have been just taking off. He appeared in a small role in last weekend’s No.-1 movie, “Forces of Nature,” with Sandra Bullock and Ben Affleck.