Hearts will immediate start their search for a successor. We take a look at some of the names likely to be mentioned over the coming days and (potentially) weeks.
1. Stephen Robinson
The Motherwell manager has successfully kept his club away from the relegation battle during his time in charge and have reached two major finals. They're currently third in the Ladbrokes Premiership.
2. Jack Ross
Was previously on the coaching staff underneath Robbie Neilson but was relieved of his duties by the club. Unless both sides are prepared to forgive and forget this is unlikely to happen.
3. Austin MacPhee
The assistant manager will take temporary charge while Hearts look for a successor. If he can immediately improve results and performances then the board may consider him.
4. Jon Daly
The ex-Rangers striker was promoted to temporary charge when Ian Cathro was sacked, winning once and drawing another in four matches before Levein took over the first-team.