Chatmon co-wrote the screenplay with Candice Sanchez McClaren about a bank robber who is more than he appears.
In the emerging narrative section screenwriter Leigh Dana Jackson and producer Moira Griffin took top honours for The Infinite Life Of Stuart Hornsley about a time-travelling lover.
Gemma Cubero and Celeste Carrasco's work-in-progress She Wants To Be A Matador about a female bullfighter took the documentary section prize and the screenwriting prize went to Anslem Richardson for the drama Bardos.
Honorable mentions went to Rodney Evans for Day Dream in the narrative section, Shawn Ku for White And Rice in the emerging narrative programme, and Lisa Collins and Mark Schwartzburt for the documentary Oscar's Comeback.
The winners were selected from 31 eligible projects whittled down from an initial pool of more than 550 entries based on the strength of their 'vision and film-making promise.' Narrative, documentary and emerging narrative winners each received a $12,000 prize while $8,500 went to the screenwriting winner.
Alka Raghuram won the L'Oreal Paris Women Of Worth 'Vision' Award and a $15,000 cash prize for her screenplay The Conqueror, in which an old feud between two villages brings tragedy to a young boy's family.
Tribeca All Access gave this year's 37 participating directors and screenwriters the opportunity to meet one-on-one with more than 140 potential investors, development executives, producers and agents.
This year marked the first time that the programme included international delegates, featuring four out-of-competition projects in the narrative category through associations with the UK Film Council, Australian Film Commission and Canadian Film Centre. All participants are eligible to apply to the year-round support programme Tribeca Access On Track.
'We continue to be impressed at the calibre of our Tribeca All Access film-makers,' festival co-founder Jane Rosenthal said. 'In just five years the TAA programme has proved to be a vibrant marketplace at the festival where strong narrative, documentary and screenwriting is presented year after year.'