Sam and Colby died together?

Famous urban explorers Sam and Colby have been found dead. There family’s are horrified and didn’t think anyone could do such a thing to the sweet boys. But some suspect that they killed each other. People think this because the police found to guns there with them one by Sam and on by Colby. Then when they went in to the lab and the scientist found one bullet in each boy but the weird thing is the one in Sam said Colby and the one Colby said Sam. Recently the boys have been having same trouble with bills and friends. So did they kill each other just because of bills or did they get killed?