The Pirates reassigned Heller to minor-league camp Sunday, Kevin Gorman of TribLive.com reports.
Heller signed a minor-league contract with the Pirates on Tuesday, Jason Mackey of the Pittsburgh Post-Gazette reports.
Heller elected to become a free agent Thursday, Justin Toscano of The Atlanta Journal-Constitution reports.
Atlanta outrighted Heller to Triple-A Gwinnett on Wednesday.
Atlanta optioned Heller to Triple-A Gwinnett on Saturday.
Heller was recalled from Triple-A Gwinnett on Wednesday.
Heller was optioned to Triple-A Gwinnett on Tuesday.
Atlanta recalled Heller from Triple-A Gwinnett on Saturday.
Heller was optioned to Triple-A Gwinnett after Wednesday's win over the Angels.
Heller retired the only batter he faced Monday to record his first hold of the season in a win over the Twins.