miss the ceremonies because of a serious leg infection, but sent a message which Kantner delivered: "Grace sends her love." In early 1992, Kantner reformed Jefferson Starship, with Balin joining a year later. Although Balin was forced to scale back his involvement with the group due to family exigencies in the mid-2000s, Kantner continued to tour and record with the band through 2015. Kantner was joined in the later versions of Jefferson Starship with various former Airplane and Starship members, most notably Casady and Freiberg, who effectively replaced Balin once again in 2005. With their latest female vocalist Cathy Richardson and Kantner's son Alexander Kantner on bass, Jefferson Starship released their first studio album since Windows of Heaven, titled Jefferson's Tree of Liberty in September 2008. The album was a return to Kantner's musical roots featuring covers of 1950s and 1960s protest songs from the American folk music revival. In late 2010 Kantner started to compile collections of "sonic art" performed by him and various artists, including a mix of cover songs, sound effects, and spoken word, releasing multiple volumes under the title "Paul Kantner Windowpane Collective". On March 25, 2015, it was reported that Kantner had suffered a heart attack. "Paul's health took a bad turn this week," the members of Jefferson Starship said via a Facebook post. "He's in the hospital, stable and undergoing tests to find out exactly what's going on, but doctors suspect he had a heart attack. He is in the best possible care and we are sending him all of our best wishes, good thoughts and healing vibes." The band also stated that they're "continuing the tour without him, as most of the shows are sold out or close to it and we have to honor our contracts and our fans who bought tickets and put on the best show possible," the band said in its official statement. "We will dedicate every show to Paul until he is well enough to rejoin us onstage." Kantner returned to the group later on in the year, in time to celebrate the 50th anniversary of Jefferson Airplane with special shows that also featured Grateful Dead tribute group Jazz is Dead. Death Kantner died in San Francisco at the age of 74 on January 28, 2016, from multiple organ failure and septic shock after he suffered a heart attack days earlier. Shortly after Kantner's death, Grateful Dead drummer