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