Nick Deacon

Nick Deacon is a Human Maquis member and the former abusive boyfriend of Starfleet officer Dorian Collins. He is also the father of Ashley Collins. He was portrayed by Dylan O'Brien.
He once cut off her long blonde hair as a warning if she ever end their relationship. 
When a pregnant Dorian Collins is taken captive by Nick, she begs him to release her. He refused. To make things worse, Dorian goes into labor. When Nick still refuses to let her go, Dorian realizes that her baby was coming and she needed Nick's help to deliver it. But Dorian suffered complication that led Nick to use surgical needs to perform a C-section on Dorian.