Fans watched as Jack and Gibbs travelled to Afghanistan to help a group of young girls who had all been trafficked.
While they were there to keep the men away, Jack saw how she could be of help in the country and wanted to stay.
After informing Gibbs she wanted to help those who needed it more, the two said an emotional goodbye, after sharing an unexpected passionate kiss.
While Maria never shared the reason for her departure from the show, perhaps the reason for her Instagram exit is to prepare for an NCIS comeback.
NCIS season 19 continues Mondays on CBS in the USA. A UK release date is yet to be confirmed.
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