Biggie discusses suicide often in his music and, by the end of his first album, Ready to Die, he shoots himself (in the song). Hemingway also frequently contemplated suicide and, by the end of his life, he shoots himself (in the face).
Both Biggie and The Notorious Hem.Ing.Way were very blunt and matter-of-fact when it came to their writing styles. Hemingway was never flashy or verbose, like James Joyce; his aim was to be true, and simple. He once said of fellow writer William Faulkner, "Does he really think big emotions come from big words? He thinks I don't know the ten-dollar words. I know them all right. But there are older and simpler and better words, and those are the ones I use." Biggie similarly avoided such flash and ornament in his writing. As Big Daddy Kane says, "[B.I.G.] didn't use a large vocabulary, his wordplay was really simple, he just put his words together a slick way and it worked real good for him."
Both men stuck to writing what they knew (bullfighting, the drug trade, being real great), and saw little value in concocting absurd fantasies. Additionally, Hemingway's protagonists are stoic men exhibiting "grace under pressure," a quality that's very important to Papa, personally and creatively. Likewise, Biggie (operating as his own protagonist), has never been known to crack under pressure -- whether dealing with serious crimes (he keeps his hand steady on his glock) or his treatment of hoes (he does not sweat them), he still boasts a smoothness that stretches all the way back to "the days of Underoos."