Please note that Mommsen uses the AUC chronology (Ab Urbe Condita), i.e. from the founding of the City of Rome. You can use this reference table to have the B.C. dates
From: The History of Rome, by Theodor Mommsen
Translated with the sanction of the author by William Purdie Dickson
Assassination of Sertorius
A second conspiracy was soon discovered, which had its seat in his own staff; whoever was denounced had to take flight or die; but all were not betrayed, and the remaining conspirators, including especially Perpenna, found in the circumstances only a new incentive to make haste. They were in the headquarters at Osca. There, on the instigation of Perpenna, a brilliant victory was reported to the general as having been achieved by his troops; and at the festal banquet arranged by Perpenna to celebrate this victory Sertorius accordingly appeared, attended, as was his wont, by his Spanish retinue. Contrary to former custom in the Sertorian headquarters, the feast soon became a revel; wild words passed at table, and it seemed as if some of the guests sought opportunity to begin an altercation.
Sertorius threw himself back on his couch, and seemed desirous not to hear the disturbance. Then a wine-cup was dashed on the floor; Perpenna had given the concerted sign. Marcus Antonius, Sertorius' neighbour at table, dealt the first blow against him, and when Sertorius turned round and attempted to rise, the assassin flung himself upon him and held him down till the other guests at table, all of them implicated in the conspiracy, threw themselves on the struggling pair, and stabbed he defenceless general while his arms were pinioned (682). With him died his faithful attendants. So ended one of the greatest men, if not the very greatest man, that Rome had hitherto produced-- a man who under more fortunate circumstances would perhaps have become the regenerator of his country--by the treason of the wretched band of emigrants whom he was condemned to lead against his native land. History loves not the Coriolani; nor has she made any exception even in the case of this the most magnanimous, most gifted, most deserving to be regretted of them all.
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Reference address : https://www.ellopos.net/elpenor/rome/5-01-lepidus-sertorius.asp?pg=54