Who should the man be within my story?

In my story that i'm writing the two main characters walk into Angel's old house, she lives next to a rich family now and she wanted to show River the other largest character her house and how she lived before being put to live near them.well When they walk in I want some guy to be waiting for them contained by Angel's room I don't know who (ex boyfriend, killer of her mom and dad ect) see Angel works for the CIA and River doesn't know yet. I want the man to try and kill Angel I only don't know how and who I want him to be to her..help please. Thanks.
Answers:
killer of her mom


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