Two more arrests have been made in the March 20th shooting death of State Highway Patrol Trooper Carl Graham, who was gunned down at his home near Van Buren. And, both people are related, by marriage, to shooting suspect Lance Shockley. 52-year-old Sherry Keeney and 32-year-old Cynthia Chilton – both of Van Buren, now face charges. Keeney has been arrested for tampering with evidence while Chilton was arrested for perjury. Both were arrested following the preliminary hearing for Shockley’s wife, Coree Shockley, who is charged with evidence tampering. Keeney is Coree Shockley’s mother while Cynthia Chilton is Coree Shockley’s sister.