From KGUN Channel 9 Tucson:
According to an FAA statement, the two planes in Marana collided in midair. Two are confirmed dead. Two people were on board the Lancair and two people were on board the Cessna 172. Helicopter footage from ABC15 shows the Cessna intact.
UPDATE 11:12 a.m.: Marana Police have now confirmed two dead in the plane crash involving two planes this morning at Marana Regional Airport.