The 44-year-old first-term governor, who was seen as a rising star in the Republican Party, abruptly resigned on Tuesday amid accusations stemming from an extramarital affair and his political fundraising.
"The last few months have been incredibly hard, for me, for my family, for my team, for my friends and for many, many people that I love", the 44-year-old said at Tuesday's news conference.
Prior to taking office, Greitens had pledged to root out "corrupt career politicians", but his brief, 17-month tenure was plagued by scandal.
St. Louis prosecutors dismissed the criminal invasion of privacy charge against Greitens on May 14 before his trial got under way but said it would be refiled.
Greitens had refused to leave even facing the prospect of becoming the first governor in Missouri's history to be impeached.
The accuser's disturbing allegations were detailed in a report by a Special Investigative Committee on Oversight of the Missouri House of Representatives.
The heat on Greitens remained as legislative leaders said the move would not impact their decision to potentially pursue impeachment.
"It's clear for the forces that oppose us, there's no end in sight", he said. Her initial comment was well-intended to "begin the healing needed from the inexcusable, embarrassing and disgusting actions of Governor Eric Greitens", she said, but admitted she probably "should have left civility at the door".
In the end, Greitens said it was dirty politics by people who didn't like his anti-establishment, anti-corruption message he brought to Jefferson City that brought him down.
"The time has come, though, to tend to those who have been wounded and to care for those who need us most", said Greitens, his voice cracking while his team members struggled to hold back tears.
The Associated Press first reported in October 2016 that Greitens' campaign had obtained a list of individuals, corporations and other nonprofits that had given at least $1,000 to The Mission Continues.
Eventually, the scandal also unspooled into a separate case looking into the illegal use of a charity donor list to raise campaign funds.
Martin said a deal to give up an elected office in exchange for the dismissal of criminal matters is unusual, but not unique.
After the second felony charge was announced in April, leading GOP officials including Attorney General Josh Hawley, Senate President Pro Tem Ron Richard and House Speaker Todd Richardson called for Greitens to step down.
It also happened on the same day a judge ordered Greitens to turn over information related to campaign payments he received from a group named A New Missouri.
"I think this is a great decision from the governor", said Sen.
Greitens said his resignation would take effect Friday.
Greitens had faced trial in early May on the invasion of privacy charge.
"Specifically regarding any deals we made with Governor Greitens' attorneys, no deals were made by my office". Some considered him a potential future presidential contender.