employees at a skateboard shop before turning the gun on himself. his mother calls him a gentle, sweet kid but police say aguilar's journal expressed general unhappiness with his life. the gun shop where aguilar purchased the gun tells cnn that the 19-year-old visited the shop twice in december. on his first visit aguilar purchased a shotgun for $430 in cash, plus two boxes of ammunition and a couple weeks later aguilar returned for another box of shotgun shells. but the big question still remains. why did he open fire in the first place? joe johns is in columbia, maryland, with the very latest. >> reporter: saying he wanted something for home defense, darion aguilar legally purchased a mossberg .520-gauge shotgun and 48 shotgun shells. the owner of the united gun shop tells cnn there were no red flags. both times aguilar visited the shop he was accompanied by a friend. today at the scene of the shoot a makeshift memorial not far from the place where 21-year-old brianna benlolo and 25-year-old tyler johnson were shot to death by aguilar.

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