WOBURN — A Winchester man is now facing a murder charge in connection with the death of his 70-year-old mother, who was found fatally beaten in her condominium earlier this month.Prosecutors on Monday issued an arrest warrant on a murder charge for 46-year-old Matthew McAveeney, whose current whereabouts are unknown.Police say McAveeney is 5-foot-6, about 250 pounds and has a shaven head.