(Portland, OR)  --  Police say they've arrested two more suspects in connection to the robbery-related shooting death of Kelso store clerk Kayla Chapman.  Police arrested 23-year-old Erkinson Bossy last night following a car chase that ended in gunfire on I-84 near the Lloyd Center.  Police also arrested a second unidentified man in the vehicle.  One of the suspects suffered life-threatening injuries, but police aren't revealing which one.  Earlier yesterday, police arrested 21-year-old Nenemeny Ekiek in connection to Chapman's killing.  Police previously arrested 19-year-old D'Anthony Williams last month.  The three suspects are accused of shooting and killing Chapman while robbing the Holt's Quik Check on Cowlitz Way on January 22nd.