All ejections should be reviewed before being called.
I could see how the ref's point of view may have led him to think the guy led with his head to get a kill shot. The player, on the other hand, even threw his hands up to attempt a tackle and a pass break up.
The booth could have determined the player's intent. Not to mention, one head-to-head collision shouldn't be an ejection; a repeat offender I could understand.