Answer: Alex's much younger girlfriend
Meg Tilly's Chloe is a bit more complex than one might realize. She first comes off as the stereotypical blonde, despite being a brunette: not very intelligent and clueless. She often makes inappropriate remarks. E.g., she bluntly tells Karen, "I found him." [referring to finding Alex dead in the bathroom after slitting his wrists]. Karen: "That must have been awful! So ... what are you going to do now?" Chloe: "Oh, we cleaned it up!" Later, in the Jeep, heading to the cabin with Harold, Sam, and Michael, Chloe suddenly interrupts their conversation to blurt out, "Alex and I made love the night before he died. It was fantastic!" This prompts the wry Nick to pun, "He went out with a bang, not a whimper," as The Rascals sing "Good Loving'" in the background.
For most of the movie Chloe's strength appears to be her physical sexuality; she has a lithe, limber, lovely body and a very cute face. Eventually, though, particularly during Nick's on-the-scene documentary filming, Chloe makes some poignant observations. "I don't enjoy talking about my past as much as you guys," and "I haven't met that many happy people. How do they act?" She is drawn to Nick, at one point saying, "You remind me of Alex." Nick snaps back, "I ain't him." Nevertheless, he and Chloe do hook up. With Harold and Sarah's blessing, Nick steps into Alex's shoes and he and Chloe will stay in the summer house and continue rehabbing the cabin Nick has come to love.
Meg Tilly is the younger sister of actress Jennifer Tilly. The Oscar-nominated Meg won a Golden Globe for her portrayal of Sister Agnes in "Agnes of God."
Interesting factoid: Actress Phoebe Cates read for the part of Chloe, and at that audition she met Kevin Kline. A few years later they married.