The settlement of the last lawsuit arising from the Challenger disaster "made it clear that there is accountability" on the part of the company that built the shuttle's flawed booster rocket, a lawyer said.

Lawyers for Morton Thiokol Inc. and the widow of astronaut Michael Smith agreed Monday to an undisclosed settlement arising from the explosion of Challenger on Jan. 28, 1986, in which the company admitted no liability."We've resolved the matter, subject to working out some details," said William Maready, a Winston-Salem, N.C., the lawyer for Jane Smith.

John Adler of Chicago, a lawyer for Morton Thiokol Inc., the rocket maker, said the parties agreed that some details of the settlement, including the sum of money that will go to Smith, will not be disclosed.

Smith originally sought $1.5 billion for her husband's death.

Former Sen. William Spong Jr., who was asked in June to try to negotiate an agreement of the lawsuit, joined the two lawyers in saying the sum agreed to would not be revealed.

The settlement in the last of the astronaut lawsuits represents the closing of a chapter on the 1986 Challenger disaster.