That was 10 years ago.
This week, Gibbes was one of more than 200 convicted felons pardoned by departing Gov. Haley Barbour.
In November 2003, he pleaded guilty to the crime of aggravated DUI-Death and was sentenced to 10 years in prison, nine years suspended, on condition he successfully complete three years supervised probation and payment of medical and funeral expenses not covered by insurance.
State authorities discharged him from that supervision in 2007.
Thirty-six on Barbour's list committed crimes in Northeast Mississippi. Some received full pardons and others got conditional clemency or medical suspensions of their sentences.
Until Tuesday, Harry Russ Bostick, 55, of Oxford was in the Lafayette County Detention Center on a suspended-sentence violation.
Bostick, a driver in a fatal Pontotoc accident in October 2011, was participating in an alternative sentence for a 2010 DUI-3rd Offense conviction when the accident occurred.
With the governor's pardon, the 2010 conviction was erased and so was his sentence violation.
But legal questions linger about whether the pardons were properly processed with mandatory public legal notices.
District Attorneys Trent Kelly of Saltillo and Ben Creekmore of New Albany said Thursday they weren't consulted about Barbour's choices.
Creekmore, a Democrat, said he was "shocked" by Barbour's decision on Gibbes, a case prosecuted by then-District Attorney Jim Hood, but one Creekmore said he can't forget because it affected so many people in the region.
Gibbes also was a student at Ole Miss, where parents and classmates reacted strongly to Treppendahl's death.
Kelly, a Republican who just took office, said, "I don't like it, period.
"A jury makes its decisions and they should be honored in most cases."
Five other pardons or clemencies involved deaths, from a Marshall County murder to negligent manslaughter in Oktibbeha County. In one case, Michael Clinton Armstrong was pardoned for the attempted enticement of a child for sex in Lee County. The rest mostly were drug convictions.
One exception was Steven A. Thompson, convicted of bribery in Benton County in 2003. Three years later, the Mississippi Legislature restored his voting rights, and Barbour signed the House bill.
Late Wednesday, Barbour issued a statement saying most of the pardons went to people already released or recommended by the state Parole Board. Attorney General Jim Hood has challenged Barbour's actions, and at Hood's request a Hinds County circuit judge on Wednesday night issued a temporary injunction blocking the immediate release of 21 of those affected.
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Wow, what a strong, committed, unyielding statement by the new republican DA.
By the way, how could this be known by a person who has never tried a jury case?