RAPID CITY, S.D. — Two Rapid City men have been charged in the death of a 56-year-old man in the city, after an eight-month investigation.

Authorities say 19-year-olds Ranon Bissonette and Hunter Highpipe have been indicted on murder, conspiracy and robbery charges. It’s unclear if they have attorneys.

Police say both men have been in custody for some time on unrelated charges and remain jailed.

Officers responded to a parking lot shortly before 3 a.m. on Sept. 17, 2015, and found the body of Edward Lowry in a pool of blood.

Police Capt. James Johns says it was a tough case to crack. He did not discuss a possible motive.

Authorities say 19-year-old Gabe Heikkinen is named as a co-conspirator in the case. He killed himself Tuesday.