So, for grins and giggles, I decided to see if the assassination is even possible given the MegaTraveller rules. (tl;dr - yes, but only because Dulinor is a munchkin and the Aslan ambassador didn't jump him.)
The Rebellion Sourcebook describes the weapon as a magnum revolver, and Travellers' Digest #9 gives Dulinor's stats as 898CBF with Handgun-4.
Strephon, Iolanthe, and Iphegenia have stats of 667ABF, 48BB8F, and 57498F. (Same source, but Iolanthe's and Iphegenia's are from 1104, not 1116. Iphegenia's may have gone up, since she was only 15; Iolanthe's might have gone down due to aging.)
The same issue of Travellers Digest gives the rolls required for Dulinor - routine task at short range, target number 7, +5DM. Problem: Short range is under 5m, and an Aslan can move 6m in one round. Before he can fire his third shot, he's in hand-to-hand combat with somebody with a dewclaw.
But we'll assume that the ambassador is too slow due to age. Okay. A magnum revolver does damage 3. Problem: damage 3 (3 dice) won't kill any of those people, since you only apply a die of damage to one stat. Dulinor absolutely needs an exceptional success (succeed by 2 or more, which doubles damage) to be able to kill in one shot. This is not actually unreasonable for the first two shots, with that +5 DM - it's still a roll of 4+, and 6+ would quadruple damage, which makes a kill almost a guarantee.
We know the ambassador is moving, so there's at least a -1DM due to that. So, a roll of 7+ is necessary to really be sure of a fatal shot. Still better than even odds. If the ambassador is charging Dulinor, that's a -3DM or so - 9+ isn't an unreasonable roll, and 7+ is still 6D damage, probably enough to kill.
And then we get to the Crown Princess. (She's had 2 rounds to react. She should be hiding behind the Iridium Throne by now. I assume it'll stop a bullet.) She can move at most 2 squares, evading, which is a -4DM on the attack. He needs an 8+ to have any chance at a kill, 10+ to guarantee it.
His odds aren't as bad as I'd thought, but he's totally munchkinned out to have that chance. (Handgun-4? Seriously?)