it must immediately have wonder who? >> right. well you wonder if this is completely random act. some stranger and it was a mistake. or you developed a list of people that might have a reason to have shot him. >> two police, it did not look random. nothing was taken. that killer struck with precision accuracy and got cleaned away. but there was something that intrigued detective voth that night. it was a clue they found in bill mclaughlin's closet. >> we do a search of the house with permission of kevin and were told their weapons in a closet upstairs. and when you come across a lot of weapons like that, it's surprising. >> in a few years before his death, bill had become an avid gun collector. he kept dozens of them in his newport beach house. but not just antiques. there were pistols, revolvers, semiautomatic weapons. including including and 16