Petrus reportedly spent Thursday working outside at his family shop in Arkansas and died that night at a North Little Rock hospital.
The University of Arkansas product spent three seasons in the NFL from 2010 to 2012, mostly with the New York Giants.
According to the Arkansas Democrat-Gazette, there was a heat advisory throughout Arkansas on Thursday with a heat index that made it feel over 100 degrees.
Those who knew Petrus mourned his death on Twitter on Friday:
Aaron Nolan @AaronNolanNews
As we continue covering the death of Former Hog #MitchPetrus I had a chance to chat with @CBSCoachNutt. He told me Mitch had an attitude like 'a little boy waking up for Christmas', he would tackle anything thrown at him. #RIPMitch #wps @PigTrailNation https://t.co/QLHKWLoABq
The Giants selected Petrus in the fifth round of the 2010 draft, and he appeared in 17 games over his first two seasons. He was on the 2011 squad that won Super Bowl XLVI over the New England Patriots.
After the Giants released Petrus in November 2012, he was signed by the Patriots and also spent time with the Tennessee Titans. The Titans released him in March 2013, concluding his NFL career.