Adnan Syed, whose murder conviction gained international attention when featured on the hit-podcast series “Serial”, walked out of prison on Monday – 23 years after he was charged with murdering his ex-girlfriend. The 41-year-old was found guilty of killing his high school classmate and onetime girlfriend Hae Min Lee in 2000. Lee, who was 18 at the time, died by strangulation in 1999 and her body was later found buried in a park in the US city of Baltimore. Syed, 17 at the time, maintained his innocence throughout the case, which was covered in a 12-part podcast series and received hundreds of…