Death Benefit by Robin Cook

Death Benefit - Pia Grazdani is a gifted, but socially stunted medical student working with Dr. Tobias Rothman, who is very disliked, at Columbia University Medical Center.  Dr. Rothman is studying different strains of the salmonella virus as well as growing human organs from stem cells.  Edmund Matthews and Russell Lefevre have invested everything they have in their new business, buying the life insurance (for pennies on the dollar) of the elderly who are ill and need cash for the medical care.  When they learn of Dr. Rothman's success in growing organs in the lab, they decide to take drastic measures.

Jack Stapleton & Laurie Montgomery play a very minor role near the end of the book.