After making a poor start from pole, the Arden driver braked too late while trying to fend off team-mate Mitch Evans into Sainte Devote and skated into the barriers, taking title contender Fabio Leimer with him.
Chain reaction incidents behind ended up collecting 14 cars and causing a red flag. Nine of those involved were unable to take the restart.
Cecotto's driving had previously attracted controversy in Malaysia - where he forced Sam Bird off the road in qualifying and was disqualified from the session - and Spain, where he pulled across on Sergio Canamasas while trying to defend his position in the second race. That incident did not result in a penalty.
Bird went on to win the Monaco race ahead of Kevin Ceccon and Evans.
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