Taming the Trap Lord

Prologue -
Rather than getting a nice introduction when she opens her doors at home, Cassie hears something tragic happening down the street from her house. She hears people yelling her brother's name.
"Marcus! Man, get out of here!"
She heard 3 gunshots fired, and the next shouts she heard of her brother's name sounded more like painful cries for help. She runs straight for the park around the corner and sees her brother laid out in the middle of the entrance of the park.
She bursts out in tears, praying and pleading to God for him to be okay. She feels arms wrap around her waist and she jumps in fear not turning around noticing the person is trying to help her. He's wearing all black so she can't see him in the dark. He picks up Marcus, and puts him in the back of his truck and waves for Cassie to get in.

"Who is this dude?" Cassie thinks to herself. He takes off his hood revealing his face, and Cassie's stomach drops...