found ten cases over the previous five of led to felony murdrges.ment that one case was that of tevin louis. >> i'll pull in over hereo you can see. >> reporter: femi soyode was tevin louis'ttorney. 2012, when louis was 19, he and emarquise sampson, his cl friend since childhood, robbed a sandwich shop on chicago'south side. >> mr. sampson came out of king gyro, and then they ran acrossy the street. and coincidentally, an officer just happened to see him running across the street holding his waistband. and the officer just, boom, and tarted chasing him allut throughese neighborhoods right over here. mr. louis went the opposite way, this way, southbound. >> reporter: the officer shot and killed sampson. he stated later that sampson had a gun.th >> i was down the street, yeah. i heard the gunshots. i was down the street. >> reporter: even though louis was down the street, he was chgewith murdering his friend. he spoke to us from prison. >> ye, it was shocking. it was... it was crushing. like, you knowcrhat i'm saying? especially the fthtor playing in he was a close friend of mine, he was my b