Brian Laundrie, seen in Aug. 12 Moab police bodycam video NORTH PORT, Fla. - One month after Brian Laundrie's remains were found at a Florida preserve, his parents have learned his cause of death was a self-inflicted gunshot wound to the head, according to the family's attorney.According to Steven Bertolino, the manner of death was suicide."Chris and Roberta are still mourning the loss of their son and are hopeful that these findings bring closure to both families," the attorney said in a statement to FOX 13.Last month, the attorney for Laundrie's parents said an autopsy on their son's remains, which were described as "bones" by North Port police, did not reveal a cause or manner of his death.