Signs that Arlington man killed family, self Troubles behind a bright exterior ← Related Article Visit The Boston Globe Share on Twitter Share on Facebook Comment on this Scroll to top of page david l. ryan/globe staff A single rose was on the front steps of 45 Newland St. in Arlington on Tuesday. david l. ryan/globe staff Relatives of Mei Kum Jones arrived at 390 Highland Ave. in Malden. david l. ryan/globe staff A mail deliverer walked past 45 Newland St. on Tuesday. Yoon S. Byun/Globe staff Scott Jones and Mei Kum Jones, both 43, and their sons, Colt and Cameron, were found dead in their home Monday. Facebook Neighbors said Mei Kum Jones was a shy woman who was very attentive to the children. Facebook Twin boys Colt and Cameron would have been 1 on Nov. 26. Steven Senne/Associated Press Middlesex District Attorney Marian Ryan described the deaths as a “very troubling,” but assured the public there was no threat to public safety. Steven Senne/Associated Press Authorities would not address how the family died or what weapons may have been used.