Episode 12 of "Highlander"
s01e12 Eyewitness

Richie arrives at Tessa's art exhibit and meets a woman. While walking amongst the guests, a lady catches her attention and they talk. The lady reveals her name to be Anne(later her last name is revealed to be Wheeler) and they continue their talk about art. Richie is walking through the city with the girl from the art exhibit and is shown doing so until nightfall. Back at the exhibit, Tessa notices Anne talking to a man on the bridge across the bay. When Tessa looks away, Anne is gone. Tessa contacts the police, but Bennett wants proof. Tessa finds where Anne lived and talks to the lady there. At the antique shop Duncan senses another immortal and goes after him. The other immortal knocks him down and runs away. At the police station, Bennett is talking with his captain and it is revealed that the captain is the immortal who ran from Duncan and killed Anne Wheeler. Duncan and Tessa visit Anne's place again and when they get back the immortal shoots at Tessa but Duncan shields her. Later, Bennett explains that Anne's body just washed up on shore and that she needs to be taken into protective custody. Duncan follows her there and saves them from the exploding house. Duncan meets the captain and they proceed to fight with Duncan winning. He returns home to Tessa and comforts her.