The 28-year-old Lapierre had four goals and six assists in 48 games with Vancouver, and appeared in four playoff games. The 34-year-old Aucoin had six goals and six assists in 41 games with the Islanders.
St. Louis also signed forwards Mark Mancari and Alexandre Bolduc to one-year, two-way contracts coming off high-scoring seasons in the AHL. The Blues drafted Bolduc in the fourth round in 2003.
The 27-year-old Mancari had 61 points in 76 games at Rochester, while the 28-year-old Bolduc had 51 points in 56 games for Portland.
They said, 'You're going to love the city. It's smaller than Philadelphia, but you're going to love it. You're going to love the fans. Just watching the playoffs last year, the fans seemed louder there than they did anywhere. I'm really excited about that.
— Forward Scott Hartnell on his upcoming season with the Columbus Blue Jackets