The mystery behind the circumstances that forced the cancelation of the UFC on Versus 4 main event continues with the release of a behind-the-scenes video of Nate Marquardt poised to make the 170-pound division limit on Saturday with remarkable ease.

Marquardt, a former number one middleweight contender, was scheduled to make his welterweight debut, taking on Rick Story at the CONSOL Energy Arena in Pittsburgh, Pa., later this evening (June 26, 2011).

However, moments before he was scheduled to tip the scale at the official event weigh in, the promotion announced that he had been ruled out because of something that happened during the pre-fight medical evaluation. Many jumped to conclusions in the immediate aftermath, concluding that a weight issue had to be to blame.

That apparently is not the case -- the visual evidence embedded after the jump clearly shows Marquardt comfortable, relaxed and walking around at 172 pounds before the weigh in, which is just one pound more than the divisional allowance of 171 pounds in non title fights.

Something now seems super fishy, especially since Marquardt has since been released by the UFC for the incident. Hopefully, we'll get the full story when the Pennsylvania Athletic Commission holds a press conference this afternoon at 4 p.m. ET.

Stay tuned. In the meantime, check out the complete Nate Marquardt weight cut video after the jump: