I can not find any online obits for your David but on Ancestry the Massachusetts death index for 1970 - 2003 gives the following information.

Massachusetts Death Index, 1970-2003 Massachusetts Death Index, 1970-2003
Name: David Paul
Certificate: 049809
Death Place: Cambridge
Death Date: 29 Oct 1997
Birth Place: Pennsylvania
Birth Date: 13 Apr 1935


Source Information:
Ancestry.com. Massachusetts Death Index, 1970-2003 [database on-line]. Provo, UT, USA: The Generations Network, Inc., 2005. Original data: State of Massachusetts. Massachusetts Death Index, 1970-2003. Boston, MA, USA: Commonwealth of Massachusetts Department of Health Services, 2005.

Description:
This database is an index to death records for the State of Massachusetts, USA, from 1970 through 2003. Researchers may find information including: deceased's full name, death date, death place (town and/or county), birth date, and birthplace.