Ronald Letis, 67, of Hamden, died Oct. 27th at Yale N.H. Hospital after a brief illness.  Born in New Haven, son of the late James & Helen Taddeo Letis, he worked as a Dental Technician for Mastercraft Dental Lab. He was the widower of Lynn Fricker Letis. Ronnie was a member of the fraternity E.S.P., and a graduate of Amity high. He is survived by sisters Joyce DeRosa of Northford and Valerie(George)Funaro of Madison, a brother James(Julieann)Letis of Woodbridge, and a number of nieces and nephews. Private services will be held at the convenience of the family. In lieu of flowers, memorial contributions may be made to the American Heart Assoc.(www.heart.org)