<table> </table> A new witness has come forward with information about the 1988 deaths of six Kansas City firefighters, raising questions about the guilt of five people serving life sentences for the crime.</p><p>The witness, Antonia Garcia, brings to at least four the number of witnesses who now say security guard Debbie Riggs or her roommate and fellow guard, Donna Costanza, implicated themselves.</p><p>Garcia signed an affidavit in which she says Riggs acknowledged involvement in the crime 20 years ago. Garcia said she told her story at the time to a retired FBI agent, but that nothing ever came of it.</p><p>Garcia&#8217;s story corroborates those of three other witnesses who say Costanza acknowledged years ago that she and Riggs were involved in setting the fires &#8212; one in a pickup truck and another near an explosives trailer &#8212; connected with the deadly blast.</p><p>&#8220;She (Riggs) admitted to me and other people &#8230; that she was involved in it,&#8221; said Garcia, who said she was a friend of Riggs&#8217; at the time of the explosion. &#8220;She came over and she was all wigged out, all disturbed that the firemen got killed&#8230;&#8221;</p><p>Garcia and the other witnesses said the arson fires were described by Costanza and Riggs as an attempt by Riggs to get rid of her pickup truck and collect on the insurance.</p><p>Riggs, who was once a suspect in the firefighter&#8217;s case, has admitted to insurance fraud in the past.</p><p>She did not respond to phone calls seeking comment. Riggs also did not answer several certified letters seeking comment. But over the years she has maintained her innocence to investigators.</p><p><strong><span class="subhead">Similar stories</span></strong></p><p>Other witnesses also have told investigators and <em>The Star </em>that Costanza had long ago admitted involvement in the crime along with Riggs.</p><p>Sandy DiGiovanni, an acquaintance of Costanza&#8217;s, confirmed in an interview that Costanza said she and Riggs were involved.</p><p>Another acquaintance, Jessica Vernon, signed an affidavit in 2000 stating that she also heard Costanza acknowledge that she was &#8220;responsible for the fire that killed the six Kansas City firefighters.&#8221;</p><p>Federal investigators interviewed Vernon but she said nothing ever came of it. &#8220;I still don&#8217;t think they (the people in prison) are the right ones.&#8221;</p><p>Vernon&#8217;s brother, Johnnie Ray Neil, told a federal investigator a similar story in 1993. He said he overheard Costanza admit she and Riggs were attempting to set fire to Riggs&#8217; truck when &#8220;things got out of hand.&#8221;</p><p>Costanza, however, has denied she ever made those statements.</p><p>Garcia&#8217;s allegations are only the latest information to surface suggesting that Riggs was responsible for the fires.</p><p>At the trial of the five defendants, Riggs admitted under oath to an earlier insurance fraud. Defense attorneys also suggested that she was involved in the crime, and that the fires were an attempt by Riggs to commit another insurance fraud.</p><p>Defense attorneys later argued in appeal documents that Riggs &#8220;indeed burned her own truck for the insurance proceeds, and then very well may have set fire to the other side of the site to make it look like she was a victim of this huge arson&#8230;&#8221; All those appeals have been unsuccessful.</p><p>Garcia told <em>The Star </em>that while Riggs told her and others that Riggs was involved, she &#8220;did not mean for anyone to get killed.&#8221;</p><p>Garcia, who acknowledges she has had drinking problems over the years for which she has sought treatment, said she would provide additional information if she is ever called to testify.