Sources:

Johhny Zera

https://icantbelieveitsnonfiction.com/2017/08/22/johnny-zera-part-1/

https://icantbelieveitsnonfiction.com/2017/08/30/johnny-zera-part-2/

https://icantbelieveitsnonfiction.com/2017/09/06/johnny-zera-part-3/

DNA doesn't crack Zera Homicide

https://www.jsonline.com/story/news/investigations/2016/11/14/dna-doesnt-crack-zera-homicide-case/93594146/