On a Wire by Ryan Lill-Washington

Casey's life has always been chaotic. Growing up in Charleston as an openly gay man hasn't made life any easier for him, a constant disappointment to his Mother's social reputation. When Casey wakes up one morning to find a dead man in his apartment, his blurred memories of one night stands and forgettable sex come crashing in around him.
Now, with no recollection of having even brought a stranger to his home, he's named the number one suspect in a spree of serial murders targeting his latest sexual trysts. With a body count rising, each branded with a blackbird tattoo, and Casey unable to remember what happened, he finds himself in the crosshairs of a serial killer, grappling between what is and isn't real.
How far would you go for the truth? How many memories must you find to retrace the moments in time you've lost? Who do you trust if you can't even trust yourself anymore? Alongside Clarke, his only sibling and source of stability, Casey is now on the run in search of the truth.
With a cavalcade of suspects, he finds himself questioning his own memories and how they tie him to the Blackbird.