The 48-year-old Brechin man was involved in a crash with a car on the B961 at Monikie on Tuesday.
Sgt Kevin Wilkie said: "Our thoughts are very much with Jonathan's family at this very difficult time.
"Our investigation to establish the full circumstances of what happened is ongoing and we continue to appeal to anyone who can assist, who has not already spoken with officers, to please get in touch.The road was closed to allow accident investigations and re-opened at about 03:30 on Wednesday.
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