Complete story — includes the ending
A teenager dies while playing tennis with Ned and a friend, and her ghost starts haunting the girl. Mel finds out that the two girls used to be friends until their mothers stopped talking and one family moved away. After the discovery that the blood clot that killed Diana is a genetic condition, it is revealed that the girls were swapped at birth. The ghost tries to stop Melinda revealing the truth.
Sources and content license
Source and revision history · Adapted from Wikipedia contributors, Ghost Whisperer season 4. HTML formatting and reference markers removed. · Content license