The book it was based on is fantastic.
Vulgar Favors: The Hunt for Andrew Cunanan, the Man Who Killed Gianni Versace https://www.amazon.com/dp/0525482571/ref=cm_sw_r_cp_api_glt_fabc_3R4NRET5B7B6J60NHGGK
It is very crazy.
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This is the link to Vulgar Favors which is by the Vanity Fair correspondent Maureen Orth - It was a compelling read. I was able to get a downloaded version from Amazon as well for Kindle.
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There is also the FBI files
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https://vault.fbi.gov/andrew-phillip-cunanan/andrew-phillip-cunanan-part-01-of-01/view
Interestingly one of the statements in the first batch towards the start on Page 16 is interesting from a friend of Cunanan's and some photographs.