In this task, you are given two sentences in the English language (Sentence 1 and Sentence 2). Your task is to identify the connecting word between the two sentences.
Q: Sentence 1:The four were suspects in the recent fatal shooting of Johnston . Sentence 2:But Johnston 's father , a retired dentist and former state legislator who owned this land , thought his son was fatally shot by a white man whose wife he had an affair with .
A:
but