Comedian Tracy Morgan was seen returning back to work on his hit sitcom 30 Rock in Manhattan, after having collapsed at the Sundance Film Festival in Utah. Morgan collapsed last week and rumors surfaced that he had been intoxicated at the time. The Daily Mail reports that exhaustion was the cause and that no alcohol or drugs were found in his system:

30 Rock star Tracy Morgan is back at work for the first time since he collapsed at the Sundance Film Festival last week.

After a brief stay in a Utah hospital the comedian was back in his native New York yesterday afternoon to work on the Emmy Award winning comedy series.

The 43-year-old looked to be in good health as he stood around waiting to begin shooting between scenes and was dressed warm for the outdoor filming.

The father-of-three played on his mobile phone before reading through the script he was about to perform at the NBC Building in Manhattan, New York City.

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