A 29-year-old man was arrested Friday evening in connection with three murders that rocked San Diego on Christmas Eve and early this year.

Carlo Gallopa Mercado, 29, was booked by San Diego police Saturday morning for three counts of first degree murder. Ilona Flint and Salvatore Belvedere, both 22, were shot in their care outside the Macy's Department Store in Mission Valley Dec. 24.

Salvatore's brother, Gianni Belvedere, was discovered missing over Christmas. Gianni was Flint's fiancee, and his body was found inside a parked car's trunk in Riverside Jan. 17.

San Diego police have issued no details but are planning to hold a news conference Monday morning.