Update: Al-Shihri says he's alive. So does a Yemen official:
The Saudi newspaper Asharq al-Awsat quoted an unnamed senior Yemeni defense ministry official as saying that DNA tests of the body have proved that the dead man was not al-Shihri.
Saeed Ali al-Shihri, the former Guantanamo inmate who after release, went to a Saudi rehabilitation camp and then returned to Yemen to form AQAP and become its second in command, has been killed in Yemen. The Yemen News Agency announcement is here.
This isn't the first time Yemen has announced al-Shihiri is dead. More on Al-Shehri (also spelled al Shihri) and the other top AQAP leaders here. You can read his father's statements disowning him here.