The hour-long broadcast, which saw a dying Molly tell Sally about her affair with Kevin, pulled in 14.03m (52%), while the audience peaked at 14.87m (52.8%) between 8.50pm and 8.55pm.
Despite the colossal figure, which is the show's best since 2003, it was unable to top EastEnders Live in February, which logged 14.9m and peaked at 16.6m.
Only 6.16m (25.3%) chose yesterday's Pat-centred instalment on BBC One, however, as the Albert Square serial fell foul to an hour of Emmerdale, which mustered 8.13m (34.7%) from 7pm.
This in turn boosted BBC Three's EastEnders repeat, which won the day's highest multichannel broadcast, grabbing a hefty 1.6m (7.1%) at 10pm.
Coronation Street: 50 Years, 50 Moments concluded with 6.8m (27.2%) in the 9pm hour, before a repeat of Coronation Street Live airing at 10.35pm on ITV1 picked up 1.89m (13.4%).
Elsewhere, Doctors notched up 1.71m (21%) for an episode titled 'Inside My Head', while more evidence of the vindictive Natasha in Neighbours nabbed 921k (11.3%).
Later at teatime, a further 1.12m (6.9%) caught the Ramsay Street soap, while Home and Away fetched audiences of 466k (6.1%) at 2.15pm, 740k (3.7%) at 6pm, and 540k (2.5%) for Fiver's first look.
Meanwhile, the truth for Kathleen in Hollyoaks was seen by 1.07m (4.9%), then E4's first look fetched 429k (1.9%).
BARB ratings data supplied by Attentional