|Portrayed by David Monahan|
|Relatives:||Tyler Barrol † (brother)|
Emily Thorne and Nolan Ross find out about him in the San Francisco Police Department's database and contact him about his brother. He later comes to Nolan's house and saves him from the binds Tyler put him in. When they get to the clambake party at the beach, Tyler has Emily at gunpoint after Conrad Grayson refuses to answer his question. Alexander convinces Tyler to talk with him and, after Tyler's attention has been diverted, Jack and Daniel manage to pin him down. ("Duress")
Alexander didn't appear in any subsequent episodes, leaving his reaction to Tyler's death unknown.