Two people are dead after an apparent murder-suicide at a north Dallas office building.Dallas police responded to a report of an active shooter in an office building in the 8300 block of the LBJ Freeway at approximately 10:45 a.m. Monday.When officers arrived on the scene, they suspected the shooter was in a meeting room. They breached the door by firing a shotgun, according to authorities.Officers found one man and one woman dead in the room.It appears the man shot and killed the woman and then turned the gun on himself, police say.According to police, the female victim was the supervisor of the gunman.