At around noon, Hideyuki Yamamoto, 32, turned himself over to police in the shooting death of Tadashi Takagi, a 55-year-old executive in the Okayama-based Ikeda-gumi, an affiliate gang of the Kobe Yamaguchi-gumi.
Yamamoto has been charged with murder and violating the Swords and Firearms Control Law.
On the morning of May 31, Takagi was shot in the chest and abdomen in a parking lot of an apartment building, located in the Toyonari area of Minami Ward.
Surveillance footage taken in the area just before the incident showed a young man on a motorbike wearing a helmet that covered his face.
Last year, 13 gangs defected from within the Yamaguchi-gumi to form the Kobe Yamaguchi-gumias a rival syndicate. Since then, a number of shooting and car-ramming incidents involving the two gangs have taken place across the nation.
Police suspect that the shooting of Takagi was also connected to the ongoing dispute between the syndicates.