After a hard fought win in Chicago, and on the cusp of a short turnaround for a Thursday afternoon matchup in Detroit the following week, the 8-1 Texans hosted the 1-8 Jaguars at Reliant.  The Texans survived an upset scare from Jacksonville thanks to a career-high 527 passing yards from Matt Schaub and 275 receiving yards from Andre Johnson.  Notably, the Texans became the first NFL team to score twice in an overtime period under the new overtime format. To open the game Matt Schuab found Keshawn Martin to make it 7-0. Then Chad Henne found Mercedes Lewis to make it 7-7. After a Texan punt, Henne found Cecil Shorts III to make it 14-7. Schuab then hit Jurrell Casey to tie it at 14. Both teams made field goals and it was 17-17 at the half. The Jaguars made a field goal to make it 20-17. After another Texan fumble, Henne found Mercedes Lewis to make it 27-17. A field goal cut it to 27-20. Then Schuab threw a pick. Henne then threw an 81-yard touchdown to Justin Blackmon to make it 34-20. The Texans answered right back with an Arian Foster td to make it 34-27. After a punt, Schuab found Garrett Graham to make it 34-34. With 5 seconds left, Randy Bullock missed a 47 yarder that could have won the game. In overtime, both teams made field goals to make it 37-37. Jacksonville had a chance to win after Houston threw an interception but they couldn't convert 4th down. With 2:10 left in overtime, Schuab threw a 48-yard touchdown pass to Andre Johnson to win 43-37. With the win, the Texans improved to 9-1 as the team swept the Jaguars.
Question: Which player had the longest touchdown score?
Answer: Justin Blackmon