John,
First of all, my condolences on your loss. Second, I am pleased that you are inclined to do something about a practice that is, at best, in poor taste, and, at worst, preying on the vulnerable and grieving.
Going to the congregation of the individual in question will do nothing to stop this practice, as the organization (what you might think of as the "church hierarchy") actively promotes this type of behavior, because it has paid off in the past in terms of converts. The Society highly recommends writing such letters and including tracts for their members who are elderly or ill, and have physical difficulties with going out in the door-knocking work that all are required to do. As a JW, my conscience was bothered by this type of activity, but JWs are taught that if your conscience conflicts with the Watchtower Society's advice, there is something wrong with your conscience!
Just so you don't miss Blondie's excellent post (from the linked section), I'm going to add it here as well. These are actual quotes from the Watchtower (w) and Kingdom Ministry (km) publications of Jehovah's Witnesses (the km is mostly an 'evangelizing how-to' monthly for members of JWs). Please consider including this in any letter to the newspapers, as it will give weight to your complaint! Good luck.
*** w99 4/1 p. 8 Preaching ‘in Favorable Season and in Troublesome Season’ ***
Following are excerpts from a letter written by a Witness who served for a time in Sarajevo.
"Besides preaching from house to house, we have tried various other methods to reach people. For example, we have had good results sharing Bible publications in the many cemeteries in the city.
***
km 8/98 p. 8 Use Brochures to Appeal to Both Mind and Heart ***When
Someone You Love Dies. Publishers who witness in cemeteries use this brochure to comfort mourners. Two sisters approached a family of seven who were praying at a grave. As a result of sharing the comforting message from the brochure, a Bible study was started with the mother the next day!***
km 10/94 p. 7 Using the New Brochure Effectively ***Keep an extra copy at hand, and use it for informal witnessing. You may wish to visit local funeral homes in your territory to see if they would like to have copies on hand to comfort bereaved families. Or you might tactfully approach grieving ones in cemeteries on occasions when they return to visit the grave of a loved one.
***
km 6/93 p. 1 Why Tracts Are So Valuable in Our Ministry Today ***Some publishers who were witnessing on a street that led to a cemetery saw people whitewashing graves. The publishers used the opportunity to offer them tracts. The next day was a holiday on which many people visit the cemetery, so the publishers decided to stand at the entrance of the cemetery and offer tracts. Over five hundred tracts were placed, with only three persons refusing them. The next year, publishers returned and distributed more than a thousand tracts, with only six refusals. A number of individuals expressed deep appreciation. One man read the tract as he was leaving, and shortly he returned to speak with the sister who had given it to him. He said: "There is someone I would like to have read this message. May I have another one?"