Kirksey (hamstring) announced Thursday that he has decided to retire from the NFL, Mike Garafolo of NFL Network reports.
Kirskey (hamstring) signed with the Bills' practice squad Wednesday.
The Texans are releasing Kirksey (hamstring) on Monday, Mike Garafolo of NFL Network reports.
Kirksey (hamstring) is expected to be sidelined for a couple weeks, Aaron Wilson of KPRC 2 Houston reports.
Kirksey had five tackles, an interception and one pass defensed in a 32-31 win over Indianapolis in Week 18.
Kirksey recorded six tackles (all solo) in Saturday's 19-14 victory against the Titans.
Kirksey logged 11 tackles (nine solo), including one sack, in Sunday's 30-24 overtime loss to the Chiefs.
Kirksey recorded 10 tackles (five solo) and one pass defensed during Sunday's 27-23 loss to the Cowboys.
Kirksey compiled seven tackles (five solo) during Sunday's 27-14 loss to the Browns.
Kirksey logged seven tackles (five solo), including one sack, in Sunday's 30-15 loss to the Dolphins.