David Strine

David Strine is the antagonist of the film Unsane by Steven Soderbergh. He is portrayed by Joshua Leonard, who is mostly known for playing Josh in The Blair Witch Project.

Personality
Like most stalkers, David is incredibly delusional and sexually repressed, having not seen another woman before or after his relationship with Sawyer Valentini and still under the impression that he will end up with her despite her open hostility toward him. He is also bout to fits of rage and violence when he does not get what he wants, ultimately killing a patient after Sawyer tricks him and murdering her mother when she tries to investigate Sawyer's being committed.

History
David met Sawyer Valentini at a hospice she had been volunteering at, where she communicated with his senile father. After he died, David and Sawyer started a relationship, but Sawyer broke it off after she could not deal with David's ceaseless attention.

After being forced to move from Boston to escape David's calls, texts, and other advances, Sawyer spots him once again at her newest job, prompting her to seek help from a counselor at Highland Creek Behavioral Center. Sawyer signs a release that she very quickly learns caused her to be committed for 24 hours. Insistant that she's sane and that she's being held against her will, she gets into physicals altercation with two other patients that leads to her being committed for a week.

She spots David, now going under the name George Shaw, while receiving her medication. Her cries to the staff that her stalker is after her fall on deaf ears when they assume she's suffering from psychotic delusions. At one point, he nearly feeds her a high, nearly lethal dose of methylphenidate to have her appear more violent and disoriented. Sawyer makes friends with Nate, another patient, who allows her to use his smuggled cell phone to call her mother. As she begins putting in the effort to have her daughter released, David catches on to this and infiltrates her motel room as an AC repairman, presumabiy killing her. He then kidnaps Nate and murders him with a lethal dose of fentanyl, which the staff assumes he stole and overdosed on.

David secretly gives Sawyer Nate's phone with pictures of him bloodied and restrained. As she frantically tries to alert the staff of David's act, she is sedated and put into solitary confinement. David is then able to speak to Sawyer alone, having deactivated the security cameras so that no one can hear their conversation. He professess his love for her and says that he's working to have it look like her insurance ran out so that she can be discharged, where they will spend the rest of their days at his cabin in the woods. Sawyer brutally mocks him for his impotence and unwillingness to move on with his life, nearly leading to him strangling her.

The next morning, Sawyer convinces David to have sex with another woman in front of her, with him believing that his doing so will make it look as though he can love someone other than her and potentially make himself more attractive to her. She chooses Violet, whom David is unaware has a shank smuggled in the waistband of her pants. After bringing her down to the padded cell, Sawyer manages to take the Violet's shank and stab David in the side of the neck. She manages to escape the hospital, but is quickly caught and knocked unconcious by David.

After waking up in the trunk of David's car with the corpse of her murdered mother, Sawyer escapes and runs off into the woods, where David catches her and breaks her ankle with a hammer. After laying beside her and stating his feelings for her, she stabs David in the eye with her mother's crucifix before slitting his throat, killing him once and for all.