This was sad:
O's Insider blog: Orioles minor-leaguer Conor Jackson, the final cut of spring camp, retires: Orioles... bsun.md/179KimE #Orioles— Eduardo A. Encina (@EddieInTheYard) April 14, 2013
Jackson is only aged 30, but his career basically fell off a cliff after 2008, when he contracted valley fever. Up to that point, he had an OPS+ of 104; after it, 73. His last major-league time came in September 2011 with the Boston Red Sox, and as noted above, he just didn't quite make it onto the Orioles roster thus spring - it appears to have been the final hurrah for CoJack. He's still third in the all-time list for on-base percentage at .358, and is also in the top ten for OPS (min. 1,500 PAs).